PJB-2024-20
GENOTYPING-BY-SEQUENCING REVEALS THE GENETIC DIVERSITY OF Cryptomeria japonica var. sinensis IN SOUTHEAS
HAN XU
Abstract
Cryptomeria japonica var. sinensis is a valuable timber and ecological tree species in East Asia. Despite previous researches that have revealed significant differences in tree height, diameter at breast height, and wood volume among C. japonica var. sinensis from different geographical sources, their genetic structure and phylogenetic relationship among different populations are still unable to accurately determined. Therefore, we extensively collected different geographical sources of Cryptomeria spp. in China (Fujian, Zhejiang area) and Japan, and performed their genetic structure and affinities by using simplified genome sequencing (GBS). A total of 306.5 Gb of sequence raw data and 875,329 high-quality SNPs were obtained, with an average of 4.26 Gb of raw data per sample. The results showed that the genetic variation of C. japonica var. sinensis populations was lower than that of C. japonica populations, and the genetic diversity of C. japonica var. sinensis in Fujian populations was slightly higher than that of Zhejiang populations. At the same time, molecular analysis of variance showed that the genetic variation of these two populations mainly came from within the population (99.6%). Furthermore, the cluster analysis results showed that C. japonica var. sinensis was clustered into five groups, and the clustering results were still consistent with the actual geographical distribution. All findings clarified the genetic background and structure of Cryptomeria spp.. This will be a reference for the conservation, utilization, and genetic breeding improvement of C. japonica var. sinensis germplasm resources.
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